Furnace pot



Aug. 8, 1939. H. H. HARRIS 2,168,334

FURNACE POT Filed Dec. 1, 1957 INVENTOR Henry H. Harm's BY 49 M' iww ATTORNEYS Patented Aug. 8, 1939 UNITED STATES,

PATENT ()FFlQE FURNACE POT Henry H. Harris, Champaign, 111.

Application December 1, 1937, Serial No. 177,427

3 Claims.

My invention relates to a furnace pot and especially to a furnace pot for containing molten cyanide, lead, and the like, for use in metallurgical operations, such as heat treatment of metal,

and the like.

The weight of pots provided for such purposes and of their contents is considerable, and as the heat is preferably supplied from beneath, top flanges have customarily been provided from m which the pots are suspended, and these flanges made broad, flat and bulky in order to afford a large amount of supporting surface.

Such an arrangement adds to the weight of the pot, adds to the cost because the flange has to be made of the same expensive alloy as required for the pot itself, introduces tremendous strains incident to turning the angle between the pot and such broad flange, is productive of great heat loss, changing pots requires considerable changes in brickwork, etc.

It is an object of the invention to provide a pot construction in which the peripheral top flange is reduced to substantially a bead flange, and to provide for supporting the pot in soft metal so as to give it a continuous support all the way around.

Another object of the construction is to provide a furnace pot with a top flange construction and support by which heat transmission and consequent heat loss is reduced to a minimum.

do Other objects will appear in connection with the following description of illustrative embodiments of the invention.

In the drawing: Fig. 1 is a plan view;

Fig. 2 is an enlarged central sectional view with parts broken away; and

Fig. 3 is a part sectional view of a modified form. 40 The pot which may be substantially rectangular, as shown, or round, or of yet other forms, is indicated by reference numeral H]. The pot is preferably cast from heat and corrosion resisting alloy of high grade, such as high-grade iron- 45 nickel-chromium alloy. The upper part of the pot wall is preferably thickened as indicated at l2 to give longer life by better resisting corrosive attack at the surface line of its molten contents.

The pot shown in Fig. 2 is formed with a narrow bead flange l4 around its upper margin, and a preferably cast flat metal ring [6 is welded about the outer edge I8 of bead flange l4, the welding metal being indicated at 20.

By arranging the encompassing ring l6-with the 55 longer dimensionof its cross section extending vertically as shown, and by forming the lower edge of ring it with the sharp pointed nose 22,

I am enabled to support the pot by the sharp nose 22 of ring it so as to provide a minimum area of pot supporting contact and to minimize 5 heat losses. The supporting ring lfishould'be cast with the pot, if desirable, but is preferably made separately and welded to the bead flange l4 as shown.

The sharp'or reduced nose 22 of ring I6 is preferably supported upon softer metal, as nickel or copper. In the form shown in Fig. 2, a broad flat supporting ring 24 is provided to rest upon the brickwork 26 about the opening for the pot, and ring 24 is provided with a depending inner l5 marginal portion 28 which terminates in the narrow marginal upwardly extending flange 30 and provides a recess 32 open at the top for receiving the ringlike piece 34 of the softer metal, as nickel or copper. The soft metal member 34 may contain a shallow groove in the region where nose 22 of ring it rests therein, or nose 22 of ringlfi may rest on the flat upper face of the member 34 formed of the softer metal, the weight of the pot and contents 'being sufficient to cause the sharp nose H) to embed itself to some extent in the softer metal.

The broad supporting ring-shaped member 24 need not be of such high grade alloy as the pot Ill, and a saving in cost can bethuseffected.

A funnel ring 38 is preferably provided and is arranged about the top of the pot, and serves to conduct back into the pot the drippings falling from the work when being removed from the pot. The lower edge of funnel ring 38 may ad- 3 vantageously rest upon the top of bead flange l2 as shown.

The heat insulating material 40 may be placed upon the supporting ring 24 and between it and the funnel ring 38, and before the funnel ring 38 40 is put in place, a confining ring or the like 42 may be provided to keep the insulation 40 in place and provide a protected working surface over the top of the insulating material 40. The outer margin of this confining member 42 is preferably support- 5 ed upon the peripheral part of the supporting ring 24 as shown. Alloy or other metal of relatively low grade and cost may be used for funnel ring 38 and the ring member 42, which are not directly exposed to the source of heat. 59

In the modified form of Fig. 3, the pot I0 is provided with a narrow bead flange l4 terminating in a narrow depending lip 44, and the supporting ring member 24' is provided about its inner edge with a narrow upwardly extending flange 46 which is sharpened at its upwardly directed edge, as indicated at 48. With this arrangement, the softer weight-carrying metal 34 is received within the downwardly opening recess 50 provided in the under side of the pot flange M behind the marginal lip 44, and the supporting contact is made with the under face of such soft metal member 34.

Numerous features of advantage are obtained by my invention, including reduced heat loss transmission and heat loss by minimum contact by supporting members, savings in cost and weight of metal used, improved capacity for rapid extending marginal flange at the top thereof, an encompassing ring welded about said flange and having a sharpened lower edge, a broad ring-form supporting member having a depending inner edge portion with an upwardly opening recess therein, relatively softer metal in said recess, the soft metal serving to support the pot by engagement therewith of said sharpened lower edge of said encompassing ring, heat insulation material upon said supporting ring, a funnel ring having its. mouth portion about the top opening of the pot, and a confining ring about said funnel ring, the funnel ring and confining ring serving with the supporting ring to enclose and protect said heat insulation material.

3. A pot and means to support same within a heat treating furnace, said pot having a marginal flange extending outwardly from the pot walls at the top thereof, a flat vertical ring member secured to and encompassing said flange, and having its lower edge reduced to a point, the supporting means comprising a ring form supporting member having a ring of softer metal disposed therewithin, said pot being supported on said ring-form member by engagement of the reduced edge with the ring of softer metal.

HENRY H. HARRIS. 

